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Ocado and Waitrose both have this on a buy 3, get the 4th one free offer.

At Ocado, the bottles are £1.62 each, so if you get 4, it works out at £1.22 per bottle.

At Waitrose they are £1.79 each, so if you get 4, it works out at £1.34 per bottle.

For those who like Asian style beer, it's worth noting that as previously posted, in store only Tesco are doing packs of 6 bottles of Tiger Beer on a 2 for £7 offer. This works out at £1.77 per litre, as opposed to £2.00 per litre for the Cobra beer in the original post.